valence electrons by group in periodic table

What is the main characteristic of the last element in each period of the Periodic Table? What is the general name of such elements? (ii) Halogens is the common name of this group elements. They all have same valency, which is equal to 1.They all try to gain one electron to obtain stable electronic configuration.They have same number of valence electrons (7).(i) Similar properties of Fluorine, Chlorine and Bromine are: (ii) What is the common name of this group or family ? Non-Metals - Hydrogen (H), Helium (He), Carbon (C), Nitrogen (N), Oxygen (O), Fluorine (F), Neon (Ne), Phosphorus (P), Sulphur (S), Chlorine (Cl), Argon (Ar).įluorine, Chlorine and Bromine are put in one group on the basis of their similar properties.Metals - Lithium (Li), Beryllium (Be), Sodium (Na), Magnesium (Mg), Aluminium (Al), Potassium (K), Calcium (Ca).Name the (i) metals (ii) metalloids and (iii) non-metals in the first twenty elements. Since these elements belong to the same group 2 and also have same number of valence electrons as calcium.

What is the basis of your choice ?īeryllium and Magnesium will show the similar chemical reactions as calcium. Name two elements that you would expect to show chemical reactions similar to calcium. (iii) Electrons revolve around the nucleus in certain definite circular paths called orbits. They are Sodium (Na), Magnesium (Mg), Aluminium (Al), Silicon (Si), Phosphorus (P), Sulphur (S), Chlorine (Cl). (ii) The third period elements are typical elements. increase or decrease) at regular intervals, are called 'periodic properties' and the phenomenon is known as the periodicity of elements. (i) The properties that reappear at regular intervals, or in which there is gradual variation (i.e. (iv) Noble gases are placed at the extreme right of the periodic table. (iii) Copper and Zinc are transition elements. (ii) Valency depends upon the number of valence electrons in an atom. (i) Elements in the same group have the same valency. (iv) Transition elements are placed at extreme right of the periodic table. (iii) Copper and zinc are representative elements. (ii) Valency depends upon the number of shells in an atom. (i) Elements in the same period have the same valency. So they accept one electron to attain stable electronic configuration hence their valency is also one. On the other hand, Group 17 (VIIA) elements have seven electrons in their outermost shell. So they donate this one electron to become stable hence their valency is one. Group 1 (IA) elements have one electron in their outermost shell.

Hence, it depends on the number of electrons in the outermost shell (i.e. Valency is equal to the number of electrons an atom can donate or accept or share. Question 6Įlements of group 1 and elements of group 17 both have valency 1. (ii) As we go from top to bottom in a group the number of shells increases one by one but the number of electron remain the same. (i) As we move across a period the number of shells remain same & number of valence electron increases by one. How does the electronic configuration in atoms change Periodicity is observed due to similar electronic configuration. (number of valence electrons/atomic number/electronic configuration) What are horizontal rows and vertical columns in a periodic table known as? How many groups and periods does modern periodic table have? The Modern Periodic Law is stated as, 'the physical and chemical properties of elements are the periodic functions of their atomic number.' Question 1(ii)

Valence electrons by group in periodic table